The collapse of the West Antarctic Ice Sheet, which holds enough ice to raise global seas by up to 15 feet (about 4.6 meters), is already underway and appears to be "unstoppable," two separate U.S. studies said Monday.

The Cau River, which is considered the means of support for northern people as it provides water to millions of people in the provinces of Thai Nguyen, Bac Ninh, Bac Giang and Hai Duong in the lower course, is getting depleted and polluted.